coffin dodger vs grayhead

coffin dodger

noun
  • An elderly person, a person close to death, or good at avoiding death. 

  • An alcoholic drink, sometimes drunk as a hangover "cure". 

grayhead

noun
  • A person with gray hair; an elderly person. 

How often have the words coffin dodger and grayhead occurred in a corpus of books? (source: Google Ngram Viewer )